You’ll find social media walls at live events of all sorts and sizes, from music festivals to in-store openings. While there are no hard-and-fast rules about when to use a social media wall, the general guideline is to use a social wall to build a buzz. For example, let’s say ...
Typical surface wind speed on Mars is about 60 miles per hour, but as Saey notes, Mars' atmospheric pressure is a scant fraction of Earth's, meaning that Mars winds don't pack much of a punch. Martian dust storms The wind speed increased slightly through the morning (max ~5 m [s.sup...